en: sw_test_tool: Add descriptions about meter table

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
en: sw_test_tool: Add descriptions about group table

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
en: sw_test_tool: Add descriptions about OpenFlow 1.4

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
en: sw_test_tool: fix overflowed table width

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
en: sw_test_tool: Add descriptions to List of Error Messages

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>